#include <iostream>

class Animal
{
public:
    virtual void speak()
    {
        std::cout<<"动物叫"<<std::endl;
    }

    virtual ~Animal() //虚析构函数
    {
        std::cout<<"父类析构函数\n";
    }
};


class Dog:public Animal
{
public:
    void speak()
    {
        std::cout<<"汪汪汪"<<std::endl;
    }

}

class Cat:public Animal
{
public:
    void speak()
    {
        std::cout<<"喵喵喵"<<std::endl;
    }

    ~Cat()
    {
        std::cout<<"子类析构函数\n";
    }
}

void Shoe(Animal *a)
{
    a->speak();
}
int main()
{
    Animal *a = new Dog; 
    Animal *b = new Cat;

    Show(a);
    Show(b);
    
    return 0;
}
